On Fri, Feb 22, 2008 at 09:22:36PM +0900, Daishi Kato wrote: > Hi, > > This might be a stupid question, > but would someone help me understand the following eval example? > I was expecting to get 1.
You're evaluating (car (1 2 3)) You want to be evaluating (car (list 1 2 3)) or (car (quote (1 2 3))) > 8<------8<------8<------8<------8<------8<------8<------8<------ > > CHICKEN > Version 2.732 - linux-unix-gnu-x86 [ manyargs dload ptables applyhook > cross ] > (c)2000-2007 Felix L. Winkelmann compiled 2007-12-04 on spirits (Linux) > > #;1> (define a 'car) > #;2> (define b '(1 2 3)) > #;3> (eval (list a b)) > Error: call of non-procedure: 1 > > Call history: > > <syntax> (eval (list a b)) > <syntax> (list a b) > <eval> (eval (list a b)) > <eval> (list a b) > <syntax> (car (1 2 3)) > <syntax> (1 2 3) > <eval> (car (1 2 3)) > <eval> (1 2 3) <-- Cheers, Peter -- http://sjamaan.ath.cx -- "The process of preparing programs for a digital computer is especially attractive, not only because it can be economically and scientifically rewarding, but also because it can be an aesthetic experience much like composing poetry or music." -- Donald Knuth
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